Grinding-disk.



T. KIHLGREN. GRINDING DISK. APPLIOATION IILBD AUG. 17, 1910.

' 992,000. Patentgd May 9, 1911.

3 BHEBT8-8HBBT 1.

WITNESSES- ATTORNEY.

' T. KIHLGREN.

GRINDING DISK.

APPLICATION FILED AUG. 17, 1910.

Patented May 9, 1911.

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A TTORNEY.

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THEDDOR KIHLGREN, OLE SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO NATIONAL EQUIPMENT COMPANY, 01* SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF lltiASSAC-HUSETTS.

GRINDINGDISI{.

cocaine.

Specification of Letters Patent.

Application filed August 17, 1910.

Patented May 9, 191i. Serial No. 577,674.,

To all whom it may concern:

Be it known that it, '.l.'nnoron rim-woman, a citizen of the United States of America, rcsiding at Springfield, in the county of l -iampden and State of il llassachusetts, have invented new and useful improvements in Grinding-Disks, of which the 't'ollowing is a specification.

This invention relates to improvements in grinding mills and is particularly designed for grinding chocolate which consists oi the ground cocoa bean and sugar mixed together, the grinding being ci'tcctcd when the inixture is in a heated condition. Previons attempts have been made to reduce '01 grind chocolate to the desired fineness by means of rolling, but such mechanisms are "found to be slow in their operation and inetIic-ient.

Broadly, my invention consists in providing two disks or plates, their contiguous faces having thereon concentrically arranged rows of teeth that are angular in cross section,--one of the disks may be fixed or both may be movable, as desired. The advancing edges of the teeth are cham'tercd so that when their apices approach each other the n'iatcrial will be caught between the chaintered edges and subjected to a grating or squeezing action, the material to be ground being introduced between the disks at their centers, and the ground material escaping around the peripheries of the same.

A further object of the. invention is to provide means for catching or retaining any particles of metal, grit, or other foreign substance of a hard nature that. may be carried into the grinding space, and this means con sists of pockets that are suitably located with reference to the point of ent ance of the material, whereby the plates are prevented from injury and the particles are removed and prevented from being retained in the finished product or ground chocolate.

In the drawings tormingpart of this applicatiom-Figure 1 shows an inside face view of one of the grinding disks which is the. same in construction as its con'ipanion. ll ig. 9 is a transverse sectional viewthrongh the d s, the section being taken on the axis .o't' t" shalt. 3 is an enlarged View on the line Li -3 0i Fig. 5 showing two of the teeth in section and ii'idieating in. dotted lines the chaint ered edges. Fig. 4 "is an enlarged detail view showing the relative post tion of the grinding teeth when in use and indicating that. the chamtered edges of the teeth are oppositely disposed or slant in the opposite directions. Fig. is an enlarged top plan View of two concentrically arranged teeth of one of the disks and clearly indi "uting the chamtcrcd surfaces on each tooth, the teeth being showh as pointing toward the right. Fig. 0 is a view otQFi 5 looking in the direction of the line o ti from the rightdiand side. Fig. 7 is a view similar to Fig. showing the teeth pointed in the opposite direction, and Fig. 8 is a view on the line S----8, Fig. 5, looking from the left.

Referring to the drawings, (1 indicates one of the grinding disks, and b the other. The

disk- (4 is preferably a rotatable one, being connected to the shaft 0 by means of the pin (1. The disk I) is provided with an inlet opening 6 having a threaded pipe f for introducing the material to be ground, as indi- -ated by the arrow f.

lteferring to Fig. 1 (which shows a general view of the toothed face of one of the disks) it. will be noticed that the same is provided with a serics'of concentrically arranged tceth or V-shaped ridges or projections 9 whichare cut transversely b means of the right-angular-shaped grooves'li that radiate from the center (Fig. 3); Between the teeth (j are V-shaped recesses for receiv-.

ing the V-shaped teeth of the companion disk. Located near the center of the disks are openings or pockets i which are for the purpose of catching or retaining any foreign substance that may be contained in'the chocolate to be ground,as small particles of iron or grit. Since these. are located near the entrance pipe f and nearthe grinding chamber 7' they will receive and retain these foreign substances before thennaterial is forced radially outward.

Referring now to the construction of the teeth shown in Figs. 3 to 8 which are enlarged detail views: It will be noticed that the inclined edge of each toot-h isprovided with chamt'cred surfaces is, plainly indicated in the plan views in Figs. 5 and 7, and in the end view of 8. The teethlg are arranged on the two disks'a and b so as to point in opposite directions, as indicated in Figs. 5 and 7, which are detailed views of tooth p to be movable in a two teeth taken from each of the disks, .and

the arrows mend n indicate the direction in which the disks rotate, or the rotative effect. The apex or to J 0 of each tooth g faces or points'toward ihc bottom of the groove of the other teeth, as indicatedin Fig. 4, in which the toothp for instance is shown located between two teeth 7' and s, and considering the teeth r and s to be fixed and the direction at right angles to the plane of the paper and away from the observer, the chamfered-surfaces 7s will be caused to move toward each other with the result that the chocolate is subjected to a pinching or squeezing action, or possibly the particles that are being ground are subjected toa grating action one over the other, or in other words a sliding effect. The inclined portions 5 of the teeth also act in the same manner as the chamfered surfaces is, but the greatest effect is produced by the surfaces is, since there is no cutting of the particles, but merely a pinching, as described.

I am aware that it is old to provide grinding disks with V-shaped teeth in cross section with, the result that the particles that are being operated is new to chainfer the edges of these teeth in order to'produce the sliding or pinching effect on the substances that are being ground. The result of this action has been found not to heat the disks as in the cutting opershaped groove h which radiates from the center forms the inclined surfaces t of the teeth 9, and the surf-ice t opposite to the surfaces 0 is vertical or normal to the plane of the disk. These right angular-shaped grooves serve thepurpose to permit the chocolate to move outwardly from the entrance pipe j during the grinding operations as the teeth pass by each other, and during this radial movement of the chocolate'some of the material is caught and subjected to a pinching effect between the chamfered surfaces, at Which point substantially all of the grinding is effected.

upon are merely cut or finely d vided; but I am not aware that 1t surface co-equal with the Width .and chamfered edges or surfaces between What I claim is 1. In a grinding machine comprising a pair of disks, the opposite faces of which are serrated or serrated facesr'adially divided by grooves, whereby teeth, V-shaped in 'cross-section are produced, the inclined or slanting edge of each tooth being chamfered, and means for rotating one or both of the disks.

,2. A grinding disl: provided with a series of concentrically arranged teeth, right-angular shaped grooves radiating from the center of the disk for providing grinding surfaces on each tooth, and each tooth having a chamdented in cross section, and the fered edge, the center of the disk having an opening therethrough for introducing the material to be ground, anda-second disk arranged in opposed relation to the first disk, as described.

.3. In a machine for grindinchocolate comprising a pair of disks eacn provided with concentrically arranged rows'of teeth intercngaging each other and each toothhaving an inclined portion, the teeth. pointing in opposite directions and each tooth having a chamfered edge on its inclinedportion for subjecting the material to a pinching effect. v j v 4:. A grinding disk having its operative face provided with teeth that are cut by angular-shaped grooves which produce an inclined surface on each tooth, each tooth having a chamfered edge adjacent the inclined surface, whereby when two such. disks are. assembled face to face, a pinching effect is imparted to the material being ground as it passes from the grinding space through the angular grooves. j

5. In a grinding disk, a tooth inverted V- provided with a vertical or normal surface, and its opposite end with aninclined fiat of the teeth,

the sides of the inverted 'V-shaped part and the inclined flat-surface.

THEODOR KIHLGREN.

Witnesses:

K. I. CLEMONS, HARRY W. Bowen.

v shaped in cross-section. and having one end v 

